When XM ccame out with their EP line I called Mobil tech and ask them if the 15,000 mile OCI was for real. He told me they tested EP for 90,000 mile OCIs with filter changes every 15,000 miles.

How could any oil hold up for 90,000 miles? Even with frequent filter changes. Has there ever been any other account of this before?

tig1, I'm not questioning your statement. It just sounds like the tech person may have misquoted the truth.

On the other hand if a car holds 5 quarts of oil but uses a quart every 3000 miles, then there is no original oil left at 15,000 miles. Throw a new filter on at that point and it's almost like an oil change. It would be a gross misrepresentation if Mobil claimed 90K out of that sort of scenario. Any synthetic could do that I bet.

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It all started when I decided to get my oil analyzed instead of my head examined...

When XM ccame out with their EP line I called Mobil tech and ask them if the 15,000 mile OCI was for real. He told me they tested EP for 90,000 mile OCIs with filter changes every 15,000 miles.

How could any oil hold up for 90,000 miles? Even with frequent filter changes. Has there ever been any other account of this befor

tig1, I'm not questioning your statement. It just sounds like the tech person may have misquoted the truth.

On the other hand if a car holds 5 quarts of oil but uses a quart every 3000 miles, then there is no original oil left at 15,000 miles. Throw a new filter on at that point and it's almost like an oil change. It would be a gross misrepresentation if Mobil claimed 90K out of that sort of scenario. Any synthetic could do that I bet.

Art, As I said I didn't ask for details,But with top off oil and filter change every 15,000 miles I can see 90,000 miles. A friend had a 76 Chevy V8, 1993 to 1999, and only used my 10,000 mile M1 with a once a year filter change. Never did pull the plug and his engine ran great all that time. He called it Mobil 2.

I'd like to see an idependent recreation of the Mobil million mile test. This time around with with all the major oil brands. Same car, same conditions, same test, same viscosity of oil. This would be a better wear protection anyalysis over a 4 ball test.

I'd like to see an idependent recreation of the Mobil million mile test. This time around with with all the major oil brands. Same car, same conditions, same test, same viscosity of oil. This would be a better wear protection anyalysis over a 4 ball test.

Never happen. No telling how much that test cost. It took 4 years to perform. M1 does do some great test. It's up to the other guys to do their 4 year test of their own oil, but they won't. 4 ball test are cheaper.

This test must have been pretty tough if they went three tranny's.You described this as a "lab test" but the vaulted BMW must have a rugged tranny. Three trannys, One engine. Speaks well for the BMW power plant and the M1 oil they used.